rev21sp09

# rev21sp09 - March 26, 2009 PHY 2054 Discussion Spring 09...

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March 26, 2009 PHY 2054 Discussion Spring ‘09 Conceptual Review: Chapter 21 A . RMS Current & Voltage 1. What is the definition of rms current/voltage? B. RLC Series AC Circuits 1. In an RLC circuit, rms voltages across each element are measured to be V R = 100 V, V L = 200 V and V C = 100 V. Calculate the rms voltage across the AC source & the phase angle. 2. Describe the asymptotic behaviors of current and phase angle when the AC frequency approaches zero or infinity. C. Power in AC Circuits 1. Express power factor in terms of resistance and impedance in an AC circuit. 2. An rms emf of 100 V is applied to an AC series circuit with R = 100 Ω, X L = 200 Ω and X C = 100 Ω. What is the power output? D. Resonance in RLC Series Circuits 1. If the frequency of an AC source is larger than the resonance frequency, does the applied voltage lead the current or lag behind current? 2. In RLC circuit in a radio is in resonance with AM 1500 KHz. If the radio station is changed to AM 750 KHz, by what factor must the capacitance be multiplied to achieve resonance again? E. Transformer

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## This note was uploaded on 12/13/2011 for the course PHY 2054 taught by Professor Avery during the Fall '08 term at University of Florida.

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rev21sp09 - March 26, 2009 PHY 2054 Discussion Spring 09...

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